General Science - Physics MCQs

Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examinations.

71. What are ultrasonic sounds?

[A] Sounds of frequencies above 2 KHz
[B] Sounds of frequencies above 20 KHz
[C] Sounds of frequencies above 200 KHz
[D] Sounds of frequencies above 20 Hz

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72. Which of the following is the cause of echo?

[A] When sound is absorbed
[B] When sound is transmitted
[C] When sound is reflected
[D] When sound is refracted

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73. Which of these parts of the ear responds to sound waves like a microphone’s diaphragm?

[A] eardrum
[B] lobe
[C] fluid in the inner ear
[D] pinna

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74. Which of the following is another unit of frequency?

[A] decibel
[B] cycle per second
[C] metre per second
[D] second

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75. What is the relationship between the velocity of sound and the pressure of gas when the temperature remains constant?

[A] directly proportional to each other
[B] inversely proportional to each other
[C] independent of each other
[D] None of the above

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76. Which of the following is correct about the speed of the sound, at same temperature?

[A] sound travels faster in humid air than in dry air
[B] sound travels slower in humid air than in dry air
[C] speed of sound is same in humid air and dry air
[D] None of the above

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77. Which of the following is correct about a Sound wave?

[A] It is a mechanical wave
[B] It is an electromagnetic wave
[C] It is both a mechanical and electromagnetic wave
[D] It is neither a mechanical nor an electromagnetic wave

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78. Which of the following represents ideal gas law?

[A] PVT = constant
[B] PT/V = constant
[C] PV/T = constant
[D] VT/P = constant

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79. What is the S.I. unit of absorptive power?

[A] dioptre
[B] metre
[C] ampere
[D] No unit

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80. What do we call the temperature and pressure at which solid, liquid, and vapor phases of a particular substance coexist in equilibrium?

[A] Equilibrium point
[B] Triple point
[C] Normal point
[D] None of the above

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